Breathing mask



FIG. 1 shows a front view of the ornamental design of a breathing mask in accordance with the invention;

FIG. 2 is perspective view of the ornamental design of FIG. 1;

FIG. 3 is a side view of the ornamental design of FIG. 1;

FIG. 4 is a reverse side view of the ornamental design of FIG. 1;

FIG. 5 is a bottom view of the ornamental design of FIG. 1; and,

FIG. 6 is a top view of the ornamental design of FIG. 1. 

CLAIM The ornamental design of breathing mask, as shown. 